API for getting commits returns inconsistent results

[Jere Jones]

I'm using the V2 API to get the commits that are in develop but not master.  The URL I'm using is similar to this:

GET https://api.bitbucket.org/2.0/repositories/owner/reposlug/commits/?exclude=master&fields=next%2Cpage%2Cvalues.author.user.uuid%2Cvalues.message%2Cvalues.summary.html&include=develop

I have also tried this:

GET https://api.bitbucket.org/2.0/repositories/owner/reposlug/commits/develop?exclude=master&fields=next%2Cpage%2Cvalues.author.user.uuid%2Cvalues.message%2Cvalues.summary.html 

Sometimes, it will return the correct commits (for my test case, about 675 commits).  Most of the time, it will return every commit on develop back to the initial commit (about 14,000 commits). 

I have captured the outputs and sometimes page 7 has no next field.  Most of the time it does.  Even when the ctx param is the same (although I have only captured that situation once).

I expect a response that would be equivalent to the following command:

git log develop ^master

I'm at a complete loss.  Any help would be very much appreciated.